Peacockish (4)
I believe the answer is:
vain
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">peacockish</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for vain that I've seen before include "is full of himself" , "Conceited, arrogant" , "Conceited and ineffectual" , "Having too much pride in one's appearance" , "Conceited - or a waste of time" .)